Pipe-holding slip



L. M. PEARCSE PIPE HOLDING SLIP Filed Nov Feb. 21, 1928.

6, 1925 3 Sheets--Shec-at 1 Feb '21 1923.

L. M. PEARCE PIPE HOLDING SLIP Filed Nov 6, 1925 3 Sheets-Sheet 2 14 H DAM?- 7 L. M PEARCZ E PIPE HULDING SLIP Filed Nov. 6, 1925 5 sheets Sheet 3 their, El, tars.

srarss PATENT OFFICE.

ABSIGNOIR TO TEXAS IRON WURKS. SALES Gilli; llfllltfllltlhl', will" .EllTJUH'QLON, rams, A COBJE'ORATION' DI TEXAS.

application filed November This invention relates to new and useful iinprovcinents in pipe holding slip. I

Unc object oi the invention is to provide a slip the character described wh ch wlll seenrely grip and hold a pipe, or tnhlng sns pended. in a Well bore and which v ill readily release the pipe when the latter is elevated through the supporting rotary talole or sup porting spider from which the pipe 1s suslll pended.

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lll'lothcr object of the invention is to rovide a slip, or the character described W nch will securely grip and hold the pipe, or tub mg, without cutting, crushing, or in uring .1110. same.

l pe holding slips, as at present construct-- ed,are formed to Wedge in between the ro-- tarp spiifler, or tithing spider, and the p pe to he held and the outside pitch of the slips is such as to cause them to Wedge so tightly, when subjected to the Weight of the pipe "l "l; when the pipe is pulled upwardly the will not release but Will carry the 3r rotary tahle up with the pipe. ll" shch f ps are given a less outside pitch to cause thcinto release they will not securely grip the pipe. Furthermore the convenlional type of slip has inside teeth to engage the pipe to prevent its slipping through the slit and these teeth often bite into and anon the pipe to such an extent that it trvi ts oil in the bore when snlnected to tor-- in in dril .lng.

herein. described has loeen spencd so that it will securely grip no pipe and will readily release l the spider so that it will not stick der or the rotary table, upon. npward movement of said pipe; its construction lacing such that it will not bite into, crush or injure the pipe being held by it.

i ll furthe' feature oi the invention resides in the pm i on oi? a pipe .nolding slip e1nhodyin ovel means .ior applying it to, and.

removing it from. the pipe or W l l ith the above and other oh' cially do and hold a, 1925, Serial m. erase.

of a rotary drilling machine with the slips in pipe holding position therein.

Figure 2 shows a vertical sectional View thereof.

Figure 3 shows a plan view of a tubing spider with the slips in. pipe holding posi tion therein; and

Figure 4 shows a vertical section view thereof Referring now more particularly to the drawings, wherein like numerals of reference designate similar parts in each of the figures the numeral 1 designates a rotary table of conventional form, having a central, vertical pipe receivinv Jening 2, and the conventional, sectiona .apterrin 3 therein, surrounding said opening. Wit in the adapter ring there is a sectional spider l, preferably formed of sections also. At its upper end the spider is counter sank on its inside forming an. annular sup orting shoulder 5. a slip ring, preferably composed of a pin-- rality of sections, as 6, each section having an external flange 7 at its upper end, adapted to seat on the shoulder 5. The sections 6 are arcuate in horizontal. cross sectional "contour, and their outer sides, beneath the flanges 7, have a pitch, or taper, down.- warolly and inwardly, so as to conform to the taper of, and to lit snugly within. a colrespondingl tapered seat in the spider 4 said taper lieing such that the sections of the slip ring will not wedge or stick in. the spider when the suspended pipe 8 is moved upwardly. The sections of the slip rin are attached to the spider by means of set holts 9 which are fitted. loosely through suitable hearings in the flanges 7' of the respective sections and screwed into the shoulder 5 beneath, with their heads counter sunk into said flanges, there being suflicient clearance between said heads and flanges to permit a limited vertical movement of. the slip ring, relative to said spider.

Slip wedges 10, are provided. These wedges are arcnate in horizontal cross-sew tional contour and their inner faces are preferably smooth and conform to the contour of and fit around the pipe 8, to be held. Three, or more, oi? these slip wedges will be employed in each. complete pi e holding slip. The outer sldcs 0 these ip wedges,

Seated in the spider t ere is other to the cross link 12 to the ends of which the respective arms 11 are pivoted. The

Wedges 10 may be secured to said arms and link in any approved manner as, for example, by Welding.

The foregoing description of the comg-lete slip applies to the two difierent types shown the tubing spider 4, shown in Figure l, in which the tubing slip is shown mounted being of s diilererut design from the rotary spider 4, shown in Figures 1 and 2, in which the pipe holding slip adapted to sustain heavier pipe, is mounted.

In the tvpe shown in Figures 1 and 2 there is hail 13 whose ends are inwardly turned and have hearings in the upwardh; extended ends of the pintles M, 14, which connect the arms 11 to the cross link 12. In this type there ere arcuste straps l5, l5, fastened to the upper ends of the slip Wedges 10, with their inner ends projecting heyond seld Wedges so that When the Wedges are swung open, away from the pipe these projecting ends will swing inwardly, as shown in dotted lines in Figure 1 to the end that when the slin wedges are again applied to the pipe these projecting ends of the straps will engage against the pipe end swing the side slips 10 in engaging position around the pipe.

In the type shown in Figures 3 and 4 the arms 11 are extended forming the handles 16, 16, with the pressure spring 17 interposed between them. When the slip Wedges are to he removed from the pipe, said wedges may be elevated out of the slip ring 6, the handles may then be moved toward each other operating on the cross link 12 to open the slip wedges and release the pipe. When it is desired to apply the slip wedges to the pipe they may he opened, as explained, and applied to thepipe and the handles, then released. and the spring 17 will operate to close the slip wedges about the pipe.

When the pipe holding slip is in position about the pipe or tubing, and such pipe is released the slip Wedges 10 will seat in the slip ring 6, which will in turn seat in the spider. The slip Wedges will wedge tightly between the slip ring and pipe and securely hold said pipe, Without injury to it by reason oi? the fact that the inner side of said wedges are smooth.

When it is desired to release the pipe hold- 511g the pipe 8 may he pulled minivan-(My end the slip ring will. readily lift up, or unseat from the spider and lhcir grip about the slip Wedges 'Wlll be thereby lQlllXQLl and said Wedges will then readily unseat Tfl'Olll.

said slip ring.

What 1 claim is 1. iii. pipe holding; slip including u seetionel slip ring having on internal down-- Wsrdly converging sent, 9. plurality of slip Wedges adapted to fit into said soul around the pipe to e held, at cross link to which one of said slip wedges is secured, arms pivoted to the respective ends of the cross link and to which the other slip wedges are secured.

2, pipe holding slip including a sectional slip ring having on internal (lowliivsrdly converging sent, u, plurality of slip wedges udantecl to fit into said scat around the pipe to he held, :1 cross link to which one of said slip Wedges is secured :lllllS pivoted to the resnective ends of the cross link and to which the other wedges are secured, said arms being extended forming handles.

3. A pipe holding slip inclliding 11. sec tionel slip ring having an internal down- "weirdly converging; scat e plurality of slip wedges adapted to lit into said scat around the'pipe to be held, cross link to which one of said slip Wedges is secured, suns pivoted to the respective ends of the cross links and. to which the other slip wedges are secured, said arms being extended forming handles and :1 yieldeble member between the handles.

4. The combination. with spider having; an internal, downwardly converging scat, 1i sectional slip ring having on. external downivurdly converging sent adapted to lit with in said spider seat, said slip ring also havingon interns-.1 downwardly converging seat having 22. greater pitch than the pitch of the external slip ring seat. means loosely connecting the sections of said ring to said spider, means preventing the complete sepsmtion of said sections from the spider, u plurality of slip wedges urcuetc ih liorizontel cross sectional contour, and Whose outer feces taper downwsrclly and are thus udupted to conform to the contour of said. in

ternel slip ring sent and to wedge between it and the pipe to be held.

5. The combination with a spider having an internal downwardly converging ecu i. a sectional slip ring having on externzil downwardly converging seat adopted to fit Within said spider sent, said slip ring also having an internal downwardly converging seat having a greater pitch than the pitch of the external slip ring sent, menus loosely connecting the sections of said ring to said spider, means lncvcnting the complete separation of said sections from the spider, u plurality of slip wedges :ircuutc in horizontel cross sectional contour and WllOSO outer taper doii'nwarrlly and are thus adopted conifoxztn to the contour of inter- V nal slip ring seat and to wedge between it and thepipe to he held and whose inner faces are smooth.

ii. The combination with a spider, having an internal downwardly converging seat, a sectional slip'ring having an external downwardly converging seat adapted to fit Within said spider, said slip ring also havingan internal downwardly converging seat hav mg a reater pitch than the pitch of the external slip ring, seat interengaging means loosely connecting the sections of said ring to said spider, ineans preventing the C0111 plete separation of said sections from the spider, a plurality of slip wedges arcuate in horizontal cross sectional. contour and Whose enter faces taper downwardly and are thus adapted to conform to the contour of said internal slip ring; seat and to wedge between it and the pipe to he held and to surround said. pipe and means for simnltaneously manipulating said Wedges.

7. The combination of a stringaoif pipe, a spider having an internal downwardly con verging seat, a slip ring having an external downwardly converging scat adapted to fit Within said spider seat, said slip ring also having an internal downwardly converging seat having a greater pitch than. the pitch of said spider seat, said slip ring being lorined of sections, means uniting the slip ring sections to the spider, said means permitting a limited increment of said scctions relative to said spider, means pioventing the complete separation oi? said sections from the spider, a plurality of slip wedges arcuate in cross sectional contour and Whose outer faces taper downwardly and conform to the contour of said internal slip ring seat, the inner faces of said Wedges having snioothhearing surfaces which rid tionaily engage the pipe to he held, and which are forced into frictional engagement with the pipe solely hy said cjsternal seat and which sustain said pipe solely by triction.

8. In a device of the character described,

a spider having an external down ardly converging seat, and an internal which converges downwardly, a slip ring having an external downwardly converging scat adapted to it Within and seat against the internal spider seat, means anchoring the slip ring to the spider, said anchoring nicans permitting only a limited Vertical. moremeat of the slip ring relative to the spider, said slip ring; being formed of sections and having an internal smooth downwardly converging; seat having a greater pitch than the external seat thereof and adapted to re ceive a slip.

Lln testimony Whereoi l have signed my name to this specification.

LOUIS M. cannon.

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